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These are variable nozzles.
PSI counts but at some point GPM is more important.
Depending on how you have them set you use from 5.25 to 10.17 gallons per minute.
For a 3/4" PVC pipe you have either Class 200 or Schedule 40.
Class 200 allows for 10 gpm design volume.
Schedule 40 allows for 7 gpm design.
If you have a 3/4" sch 40 pipe it is possible you are overdrawing your supply.

they are on a Hunter shrub adapter directly on a 4" inch fixed riser. The rotor itself is not opening all the way each time.

I did not expect 4 rotor on a 3/4 inch circuit to be a problem at 50 psi. The farthest rotor is about 50 ft from the valve where the pressure is measured. I don't have the needed fitting to measure the pressure at the rotor right now.

Hunter MP rotors not working properly

Rotors not opening or rotating.

I just got my shipment of Hunter MP rotors. I attached four of them to shrub adapters on 4" risers. There are four rotors on the circuit of 3/4 plastic pipe. The water pressure at the valve is about 50 psi. When the valve opens two of the rotors appear to work properly (although I am disappointed with the radius). The other two just won't pop consistently and when the do they aren't rotating.